How much revenue did Half-Life 2: Episode One make?

Half-Life 2: Episode One is free to play, so there is no copy-sales revenue to estimate.

How many copies did Half-Life 2: Episode One sell?

Q: How many copies did Half-Life 2: Episode One sell?

2.0M to 3.2M copies, based on its 31k Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 2.0M–3.2M; from 31k reviews (Overwhelmingly Positive)

Copies are estimated from the public review count, adjusted for release year, and cross-checked against SteamSpy's own estimate.

Did the prediction match what actually happened?

We hid Half-Life 2: Episode One and predicted how it would do from its 8 similar games. Every figure here, including Half-Life 2: Episode One's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 3.2M–14.9M

best case 32.0M (Cyberpunk 2077)

Games like Half-Life 2: Episode One

A typical game among these

≈ 3.2M–14.9M copies

≈ $27.8M–$146.9M after Steam's cut

from ~145k reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

All 8 of the similar games are hits.

Best case: Cyberpunk 2077 at ≈ 24.4M–39.6M copies, ≈ $402.0M–$1080.8M after Steam's cut.

What their first month looked like

About half the games that made it here had over 32k reviews in their first month; the range was 481 to 326k.

The genre you'd be entering

These games: The similar games share FPS (8 of 8) and Sci-fi (7 of 8).
The winners: Winners here lead with Cyberpunk + Open World, priced around $60.
When they shipped: The similar games span 2004 to 2021, and none of them shipped in the last two years.

How these numbers were worked out

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Half-Life 2: Episode Two 2007	Est. copies ≈ 2.6M–4.2M SteamSpy 5M–10M	Est. revenue Free	Free	41k reviews Overwhelmingly Positive	FPSAction
BioShock Infinite 2013	Est. copies ≈ 9.2M–15.0M SteamSpy 2M–5M	Est. revenue $76.0M–$204.4M after Steam's cut $138.2M–$314.4M before Steam's cut	$29.99	146k reviews Very Positive	FPS Story Rich
Halo: The Master Chief Collection 2019	Est. copies ≈ 7.6M–12.3M 1.8x vs typical SteamSpy 5M–10M	Est. revenue $83.3M–$223.9M after Steam's cut $151.4M–$344.5M before Steam's cut	$39.99	263k reviews Very Positive	Great SoundtrackFPS
Black Mesa 2020	Est. copies ≈ 3.6M–5.8M SteamSpy 2M–5M	Est. revenue $19.8M–$53.2M after Steam's cut $35.9M–$81.8M before Steam's cut	$19.99	145k reviews Very Positive	FPSRemake
Half-Life 2 2004	Est. copies ≈ 17.7M–28.8M 1.9x vs typical SteamSpy 10M–20M	Est. revenue $48.6M–$130.7M after Steam's cut $88.4M–$201.1M before Steam's cut	$9.99	280k reviews Overwhelmingly Positive	FPSAction
Cyberpunk 2077 2020	Est. copies ≈ 24.4M–39.6M 6.8x vs typical SteamSpy 20M–50M	Est. revenue $402.0M–$1080.8M after Steam's cut $730.9M–$1662.7M before Steam's cut	$59.99	983k reviews Very Positive	CyberpunkOpen World
Deus Ex: Human Revolution - Director's Cut 2013	Est. copies ≈ 1.9M–3.1M SteamSpy 2M–5M	Est. revenue $10.4M–$28.0M after Steam's cut $19.0M–$43.1M before Steam's cut	$19.99	30k reviews Very Positive	CyberpunkStealth
INDUSTRIA 2021	Est. copies ≈ 108k–176k SteamSpy 500k–1M	Est. revenue $595k–$1.6M after Steam's cut $1.1M–$2.5M before Steam's cut	$19.99	4k reviews Mostly Positive	FPSAction